rhaponticum repens

rhaponticum repens specifications

  • Scientific name : Rhaponticum repens
  • Order : Asterales
  • Family : Asteraceae
  • Tribe : Cardueae
  • Genus : Leuzea
  • Species : L. repens

    Rhaponticum repens , synonyms including Acroptilon repens and Leuzea repens , with the common name Russian knapweed, is a bushy rhizomatous perennial, up to 80 cm tall. Stems and leaves are finely arachnoid-tomentose becoming glabrous and green with age. The rosette leaves are oblanceolate, pinnately lobed to entire, 2–3 cm wide by 3–8 cm long.

    The lower cauline leaves are smaller, pinnately lobed; the upper leaves become much reduced, sessile, serrate to entire. The heads are numerous terminating the branches. Flowers are pink to purplish, the marginal ones not enlarged. The outer and middle involucral bracts are broad, striate, smooth with broadly rounded tips; the inner bracts are narrower with hairy tips. Pappus present with bristles 6–11 mm long. Fruit is a whitish, slightly ridged achene.

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    Rhaponticum repens

    Russian knapweed is a deep-rooted long-lived perennial. Some stands have been in existence for 75 years. It forms dense colonies in cultivated fields, orchards, pastures, and roadsides.

    A native to Eurasia, Russian knapweed was introduced into North America in the late 19th century. Absent only from southeastern U.S , it has become widespread in other regions, especially in the western United States.

    Overview

    • Appearance

    Rhaponticum repens is a perennial forb that can grow to 3 ft. (1 m) in height. Stems originate from a basal rosette of leaves. The rosette leaves can be unlobed to very lobed and are 2-4 in. (5-10 cm) long.

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    • Foliage

    Stem leaves are oblong, pinnately lobed to entire and up to 6 in. (15.2 cm) in length at the base of the stem and become smaller and less lobed toward the top.

    • Flowers

    In summer to fall Rhaponticum repens produces flowers that are pink to purple and turn straw colored as they mature. The flower heads are approximately 0.5 in (1.2 cm) in diameter and urn shaped.

    • Fruit

    Fruits (achenes) are ivory-colored with a tuft of hair that falls off at maturity.

    Iran dried rhaponticum repens

    In addition to its decorative aspect, dried rhaponticum repens flower has many applications in traditional medicine and pharmacy. The reasonable price of dried rhaponticum repens flowers has caused the purchase and sale of dried rhaponticum repens flowers for export to bring huge profits to the exporters and wholesalers of dried rhaponticum repens flowers.

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    Propagate the rhaponticum repens plant

    Rhaponticum repens turns green in early spring, begins to bloom in May and June ( depending on the altitude of the region ) and continues to bloom during summer and autumn. Each flowering branch produces about 50 to 500 seeds. The seeds live in the soil for 2 to 3 years.

    • By seed

    The seeds are heavy and not easily spread by wind. Most seeds fall within one metre of the parent plant. Seeds can move in hay, seed, grain and machinery. Water spreads the seeds along streams and irrigation channels. Grazing animals can eat the seeds which survive to pass through the gut. Seeds can stick to fur and fibres.

    • By plant parts

    New plants grow from buds on the horizontal roots. Root fragments as small as 2.5 cm can become new plants. Cultivation equipment can spread root fragments. Livestock can pull plants from the ground and move the weed to new areas.

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